* {
    margin: 0;
    padding: 0;
    list-style: none;
}

html,
body {
    width: 100%;
    height: 100%;
    background-image: url("./3.jpg");
    background-size: 100% 100%;
    overflow: hidden;
}

.wrap {
    width: 800px;
    margin: 50px auto;
}

.wrap button {
    width: 200px;
    height: 45px;
    border: 0;
    border-radius: 8px;
    background: white;
}

.wrap ul {
    width: 100%;
    padding: 20px;
    box-sizing: border-box;
}

.wrap ul li {
    width: 100%;
    background: white;
    padding: 20px;
    box-sizing: border-box;
    border-bottom: 1px solid #ccc;
}

.mask-box {
    position: fixed;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, .5);
    left: 0;
    top: 0;
    display: none;
}

.mask-box.active {
    display: block;
}

.mask {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    padding: 20px;
    background: white;
    display: none;
}

.mask.active {
    display: block;
}

.mask span {
    position: absolute;
    right: 20px;
    top: 20px;
}